14 results about "Seepage force" patented technology

The application provides a local surge-induced adjacent reef seabed topography evolution model test device and test method, and the device comprises a soil box, a soil layer, a runner, a handle, a support, a fixing ring, a hose, an adjusting pipe, a pore pressure gauge, a displacement gauge and a partition plate. A constant pressure water head is set at one end to simulate a far-field water pressure, a hose fixed on the runner periodically rises and falls at the other end, a periodic surge pressure is formed in the soil layer on the right side of the partition plate, and the local scouring and far-field pressure seepage migration effects of the local surge on the adjacent reef seabed are simulated. The pore pressure gauge is used to determine the pore pressure change of the stratum to analyze the local scouring force and the far-field stratum seepage force change of the adjacent reef seabed, and the displacement gauge is used to determine the stratum displacement to analyze the local scouring deformation and the far-field pressure seepage migration law of the adjacent reef seabed. The influence of the local surge cycle, amplitude and pressure sudden increase point position on the surface morphology of the adjacent reef seabed is researched, and analysis basis is provided for the adjacent reef seabed topography evolution, far-sea island reef construction and erosion protection.

The invention relates to the technical field of water conservancy projects, and particularly discloses a method for calculating the void scale caused by soil loss under a pump station bottom plate and electronic equipment, and the method comprises the steps: determining the maximum water head difference of two sides of a pump station, the soil particle density and the total length of the pump station bottom plate, and estimating the diameter of a gap channel; and carrying out stress analysis on the microcosmic soil particle units on the side wall of the gap channel, wherein the stress comprises effective gravity, drag force, seepage force, lifting force, cohesive force, supporting force, sliding friction force and rolling friction moment. According to the method for calculating the void scale caused by soil loss under the pump station bottom plate, a particle kinetic method is introduced, gap channel water flow under the bottom plate is regarded as pressure pipe flow, particle stress analysis, a sliding / rolling instability mode and a Kolbolok-White formula of a turbulent flow hydraulic transition area are comprehensively considered, and the void scale caused by soil loss under the pump station bottom plate is calculated. The length of the void development channel can be quickly calculated based on engineering parameters, and the void position and the risk range can be determined.

The application discloses a soil body water seepage early warning device for geotechnical engineering and belongs to the technical field of geotechnical engineering. The soil body water seepage early warning device for geotechnical engineering comprises a landslide, the top surface of a landslide surface layer is provided with a water intercepting ditch, the top surface of the landslide surface layer is provided with a drainage ditch, the inside of the landslide is provided with detection assemblies, the detection assemblies comprise water releasing pipes and alarm mechanisms arranged in the inside of the shallow layer and the weathered mudstone-sandstone interbedding. The landslide surface is drained through the cooperation of the water intercepting ditch, the drainage ditch and the waterfall groove. The water infiltrated due to heavy rainfall or the underground water contained in the slope body can be quickly gathered and discharged through the water releasing pipes, the surface water body can be effectively reduced, the strength and the dead weight of the lower soil body can be maintained, the permeability can be reduced, when the water content in the inside of the slope body reaches a dangerous value, the water level in the inside of the water releasing pipe is increased and drives the alarm mechanism to work to issue an alarm, and meanwhile, the alarm mechanism can accelerate the discharge of the accumulated water in the inside of the water releasing pipe.

This invention discloses a model test apparatus and method for analyzing the influence of seepage force on sediment initiation under wave-current action. The apparatus includes a horizontal water tank made of plexiglass, a wave-current generator, a seepage force generator, and a data acquisition module. The combined reciprocating motion of a first and second piston installed at the end of the horizontal water tank creates a reciprocating flow to simulate wave motion. A circulating water system is added to simulate the combined effect of wave and current. A first water reservoir simulates different water depths through air pressure regulation. The seepage force generator is used to place sediment samples and generate seepage force with a specified distribution. The data acquisition module is used to collect the data required for the experiment. The sediment initiation process is observed using a high-definition digital imaging device combined with image processing technology. This invention has the advantages of small footprint, convenient operation, and precise control.

This invention discloses a method for calculating critical hydraulic gradient based on particle size distribution curves. It includes the following steps: determining all soil particle size groups that may be activated when soil seepage failure occurs; plotting a particle size-to-weight ratio curve; converting the ordinate of the particle size-to-weight ratio curve into the cumulative volume percentage of soil particle size; calculating the distinguishing particle size d0 between coarse and fine particles, and determining the initiating particle size d that causes soil failure when seepage failure occurs, where d ≤ d0; deriving the critical hydraulic gradient calculation formula when particle size groups smaller than or equal to the initiating particle size d are simultaneously subjected to seepage force; treating particle size groups smaller than the initiating particle size d as a loss state, and considering coarse particles and particle size groups equal to the initiating particle size d as jointly bearing the seepage force, and calculating the critical hydraulic gradient value. This invention can more accurately calculate the critical hydraulic gradient value closest to the actual value, obtaining a critical hydraulic gradient value for soil that conforms to engineering practice.

This invention discloses a method for calculating borehole grouting pressure and stability considering the seepage softening effect, comprising: S1. Parameter acquisition and problem definition; S2. Establishing governing equations considering the seepage effect; S3. Solving for displacement and stress field in the elastic zone; S4. Solving for displacement and stress field in the plastic zone; S5. Determining the borehole inner diameter, plastic radius, and ultimate grouting pressure. This invention, for the first time, fully couples seepage force and soil softening effect in a unified analytical model, more realistically reflecting the complex mechanical mechanism of the grouting process. Starting from basic mechanical principles, the derivation process is rigorous, providing a complete semi-analytical solution from stress to displacement with clear physical meaning. This method can be quickly applied to engineering calculations, parameter sensitivity analysis, and safety assessment. By adjusting parameters, it can flexibly degenerate into a specific case considering only a single effect, facilitating mechanism research and comparative analysis, and demonstrating strong universality.

The invention discloses a soil body water seepage early warning device for geotechnical engineering, and belongs to the technical field of geotechnical engineering. The soil body water seepage early warning device for geotechnical engineering comprises a landslide, an intercepting ditch is formed in the surface of the top end of the surface layer of the landslide, a drainage ditch is formed in the surface of the top end of the surface layer of the landslide, and a detection assembly is arranged in the landslide; the detection assembly comprises a water drainage pipe and an alarm mechanism which are arranged in the shallow layer and the weathered mudstone and sandstone interbed. Water on the surface of a landslide is drained through cooperation of the intercepting ditch, the drainage ditch and the water falling groove, water infiltrated due to heavy rainfall or underground water contained in a slope body can be rapidly gathered and rapidly drained through the water drainage pipe, and water infiltrated from the earth surface can be effectively reduced, so that the strength and the dead weight of a lower-layer soil body are kept, and the seepage force is reduced; when the water content in the slope body reaches a dangerous value, the water level in the water drainage pipe is increased, the alarm mechanism is driven to work and give an alarm, and meanwhile the alarm mechanism can accelerate drainage of accumulated water in the water drainage pipe.

The present application relates to the technical field of drilling in soil rock, and particularly relates to an ultra-high pressure stratum plugging and grouting device for drilling operation and a method thereof, which comprises a tool pipe body, an axial movable core and an elastic assembly, realizes flow channel switching logic by using grouting back pressure, sprays slurry mixed with an excitation agent from a central nozzle for filling and anti-scouring reinforcement of a large leakage stratum under low pressure working condition, reverses the axial movable core by back pressure under high pressure working condition, physically closes the catalytic flow channel and leads the pure slurry to be sprayed from the side wall flow guide hole, generates an ultra-high pressure jet by using a small cross-sectional area to penetrate the micro-cracks of the well wall, and is provided with a trigger sensor at the end of the device to feed back the downhole compaction signal. The present application solves the technical pain points of well leakage, well wall collapse and dynamic water dilution in the drilling process, realizes intelligent mechanical regulation and control of the downhole grouting process, and has the advantages of strong penetration, phase self-adaptation and construction precision.

The present invention discloses a method and system for discriminating the seepage of a double-layer dam foundation. The method includes: S1, obtaining the geological parameters of the double-layer dam to form a set of geological parameters; S2, constructing a seepage numerical model of the double-layer dam foundation to simulate the seepage field distribution at each grid node of the double-layer dam foundation and obtaining seepage field data; S3, calculating the seepage force of the grid node to determine the potential seepage failure area; S4, monitoring the changes in pore water pressure and seepage flow rate of preset monitoring points within the potential seepage failure area; S5, constructing a seepage failure discrimination model and outputting a seepage determination result; S6, performing hierarchical processing according to the determination result of seepage failure and outputting a graded seepage warning message through a seepage grading model. The present invention realizes the discrimination, real-time monitoring and graded early warning of the seepage failure of the double-layer dam foundation, and ensures the safety of the heterogeneous double-layer dam.

The present application relates to the technical field of drilling in soil rock, and particularly relates to an ultra-high pressure stratum plugging and grouting device for drilling operation and a method thereof, which comprises a tool pipe body, an axial movable core and an elastic assembly, realizes flow channel switching logic by using grouting back pressure, sprays slurry mixed with an excitation agent from a central nozzle for filling and anti-scouring reinforcement of a large leakage stratum under low pressure working condition, reverses the axial movable core by back pressure under high pressure working condition, physically closes the catalytic flow channel and leads the pure slurry to be sprayed from the side wall flow guide hole, generates an ultra-high pressure jet by using a small cross-sectional area to penetrate the micro-cracks of the well wall, and is provided with a trigger sensor at the end of the device to feed back the downhole compaction signal. The present application solves the technical pain points of well leakage, well wall collapse and dynamic water dilution in the drilling process, realizes intelligent mechanical regulation and control of the downhole grouting process, and has the advantages of strong penetration, phase self-adaptation and construction precision.

The embodiment of the invention provides a reservoir water repeated lifting type soil body periodic bidirectional permeation erosion test device and method, and relates to the field of geotechnical engineering. The reservoir water repeated lifting type soil body periodic bidirectional permeation erosion test device comprises a water supply device, a permeation erosion device, a lifting platform, a particle collection device and a particle-water separation device. Aiming at the actual seepage working conditions that the soil body of the canyon riverway type reservoir hydro-fluctuation belt is subjected to periodical seepage, seepage from the outside of the slope to the inside of the slope and seepage from the inside of the slope to the outside of the slope under the action of repeated lifting of reservoir water, the device can simulate the effect of periodical seepage force action from the outside of the slope to the inside of the slope and from the inside of the slope to the outside of the slope in the horizontal direction by opening and closing four valves; compared with an existing seepage deformation test instrument, the seepage deformation test instrument is more in line with the actual working condition of the soil body of the canyon river channel type reservoir hydro-fluctuation belt, the efficiency in the test process is high, meanwhile, the cycle process of repeated lifting of reservoir water can be accurately simulated, the consumed time is short, and erosion fine particles collected by seepage in the horizontal direction are more accurate than erosion fine particles collected by seepage in the vertical direction.

The present invention discloses a device and a preparation method for preparing normally consolidated marine sedimentary soil, belonging to the field of marine geotechnical engineering. The test device includes an air compressor, a water storage cylinder, a pressure consolidation cylinder, a pneumatic control system, a water level monitoring system, a temperature control system and a soil strength testing system. Based on the hydraulic gradient, the present invention utilizes the seepage force to increase the vertical stress acting on the soil sample, realizes a pseudo-supergravity effect, and further completes the preparation of the normally consolidated soil sample in the model test. Moreover, the soil strength can be tested through the soil strength testing system, which has the advantages of strong feasibility, strong scientificity and good comprehensiveness.

The present application provides a kind of river type narrow foundation pit anti-heave stability calculation method, by considering the blocking effect of circular sliding heave on side soil and supporting structure, introduce topographic related factors slope angle and river distance, and river level variation produces four parameters of force and seepage force to traditional calculation method, obtain the calculation result of river type narrow foundation pit anti-heave stability.The upper part of the soil in the soil outside the pit slope angle and river distance, and river level variation produces force and seepage force to pit.The upper part of the soil in the soil outside the pit slope angle and river distance two parameters are to reflect the uneven terrain problem of calculating the river type narrow foundation pit outside the pit soil, make up the defect that traditional method does not consider the pit outside terrain factor.The river level variation produces force and seepage force two parameters to pit in order to reflect the influence problem of calculating the river type narrow foundation pit outside the river, make up the advantage that traditional method does not consider the pit outside river influence factor.

The present invention discloses a numerical simulation method and device for simulating rock and soil seepage force based on discrete element particle flow. The present invention uses the discrete element method to establish a rock and soil model, and adopts particle assembly rock and soil to completely and realistically restore the actual state of the rock and soil skeleton compared with finite element and boundary element methods. On this basis, the present invention uses the fluid-solid coupling algorithm to generate a seepage network of fluid flow in the pore throat of the rock and soil model to simulate the seepage process of the fluid in the rock and soil pore throat, and applies the effect of the seepage force to the rock and soil particles in the form of volume force, thereby finally realizing the effect of the seepage force on the rock and soil in the fluid seepage process based on discrete element particle flow simulation, thereby providing a reliable numerical simulation method for the next step of analyzing engineering mechanics problems.